function positionInfo(object) {



  var p_elm = object;



  this.getElementLeft = getElementLeft;

  function getElementLeft() {

    var x = 0;

    var elm;

    if(typeof(p_elm) == "object"){

      elm = p_elm;

    } else {

      elm = document.getElementById(p_elm);

    }

    while (elm != null) {

      x+= elm.offsetLeft;

      elm = elm.offsetParent;

    }

    return parseInt(x);

  }



  this.getElementWidth = getElementWidth;

  function getElementWidth(){

    var elm;

    if(typeof(p_elm) == "object"){

      elm = p_elm;

    } else {

      elm = document.getElementById(p_elm);

    }

    return parseInt(elm.offsetWidth);

  }



  this.getElementRight = getElementRight;

  function getElementRight(){

    return getElementLeft(p_elm) + getElementWidth(p_elm);

  }



  this.getElementTop = getElementTop;

  function getElementTop() {

    var y = 0;

    var elm;

    if(typeof(p_elm) == "object"){

      elm = p_elm;

    } else {

      elm = document.getElementById(p_elm);

    }

    while (elm != null) {

      y+= elm.offsetTop;

      elm = elm.offsetParent;

    }

    return parseInt(y);

  }



  this.getElementHeight = getElementHeight;

  function getElementHeight(){

    var elm;

    if(typeof(p_elm) == "object"){

      elm = p_elm;

    } else {

      elm = document.getElementById(p_elm);

    }

    return parseInt(elm.offsetHeight);

  }



  this.getElementBottom = getElementBottom;

  function getElementBottom(){

    return getElementTop(p_elm) + getElementHeight(p_elm);

  }

}



function CalendarControl() {



  var calendarId = 'CalendarControl';

  var currentYear = 0;

  var currentMonth = 0;

  var currentDay = 0;



  var selectedYear = 0;

  var selectedMonth = 0;

  var selectedDay = 0;



  var months = ['January','February','March','April','May','June','July','August','September','October','November','December'];

  var dateField = null;



  function getProperty(p_property){

    var p_elm = calendarId;

    var elm = null;



    if(typeof(p_elm) == "object"){

      elm = p_elm;

    } else {

      elm = document.getElementById(p_elm);

    }

    if (elm != null){

      if(elm.style){

        elm = elm.style;

        if(elm[p_property]){

          return elm[p_property];

        } else {

          return null;

        }

      } else {

        return null;

      }

    }

  }



  function setElementProperty(p_property, p_value, p_elmId){

    var p_elm = p_elmId;

    var elm = null;



    if(typeof(p_elm) == "object"){

      elm = p_elm;

    } else {

      elm = document.getElementById(p_elm);

    }

    if((elm != null) && (elm.style != null)){

      elm = elm.style;

      elm[ p_property ] = p_value;

    }

  }



  function setProperty(p_property, p_value) {

    setElementProperty(p_property, p_value, calendarId);

  }



  function getDaysInMonth(year, month) {

    return [31,((!(year % 4 ) && ( (year % 100 ) || !( year % 400 ) ))?29:28),31,30,31,30,31,31,30,31,30,31][month-1];

  }



  function getDayOfWeek(year, month, day) {

    var date = new Date(year,month-1,day)

    return date.getDay();

  }



  this.clearDate = clearDate;

  function clearDate() {

    dateField.value = '';

    hide();

  }



  this.setDate = setDate;

  function setDate(year, month, day) {

    if (dateField) {

      if (month < 10) {month = "0" + month;}

      if (day < 10) {day = "0" + day;}



      var dateString = year+"-"+month+"-"+day;

      dateField.value = dateString;

      hide();

    }

    return;

  }



  this.changeMonth = changeMonth;

  function changeMonth(change) {

    currentMonth += change;

    currentDay = 0;

    if(currentMonth > 12) {

      currentMonth = 1;

      currentYear++;

    } else if(currentMonth < 1) {

      currentMonth = 12;

      currentYear--;

    }



    calendar = document.getElementById(calendarId);

    calendar.innerHTML = calendarDrawTable();

  }



  this.changeYear = changeYear;

  function changeYear(change) {

    currentYear += change;

    currentDay = 0;

    calendar = document.getElementById(calendarId);

    calendar.innerHTML = calendarDrawTable();

  }



  function getCurrentYear() {

    var year = new Date().getYear();

    if(year < 1900) year += 1900;

    return year;

  }



  function getCurrentMonth() {

    return new Date().getMonth() + 1;

  } 



  function getCurrentDay() {

    return new Date().getDate();

  }



  function calendarDrawTable() {



    var dayOfMonth = 1;

    var validDay = 0;

    var startDayOfWeek = getDayOfWeek(currentYear, currentMonth, dayOfMonth);

    var daysInMonth = getDaysInMonth(currentYear, currentMonth);

    var css_class = null; //CSS class for each day



    var table = "<table cellspacing='0' cellpadding='0' border='0'>";

    table = table + "<tr class='header'>";

    table = table + "  <td colspan='2' class='previous'><a href='javascript:changeCalendarControlMonth(-1);'>&lt;</a> <a href='javascript:changeCalendarControlYear(-1);'>&laquo;</a></td>";

    table = table + "  <td colspan='3' class='title'>" + months[currentMonth-1] + "<br>" + currentYear + "</td>";

    table = table + "  <td colspan='2' class='next'><a href='javascript:changeCalendarControlYear(1);'>&raquo;</a> <a href='javascript:changeCalendarControlMonth(1);'>&gt;</a></td>";

    table = table + "</tr>";

    table = table + "<tr><th>S</th><th>M</th><th>T</th><th>W</th><th>T</th><th>F</th><th>S</th></tr>";



    for(var week=0; week < 6; week++) {

      table = table + "<tr>";

      for(var dayOfWeek=0; dayOfWeek < 7; dayOfWeek++) {

        if(week == 0 && startDayOfWeek == dayOfWeek) {

          validDay = 1;

        } else if (validDay == 1 && dayOfMonth > daysInMonth) {

          validDay = 0;

        }



        if(validDay) {

          if (dayOfMonth == selectedDay && currentYear == selectedYear && currentMonth == selectedMonth) {

            css_class = 'current';

          } else if (dayOfWeek == 0 || dayOfWeek == 6) {

            css_class = 'weekend';

          } else {

            css_class = 'weekday';

          }



          table = table + "<td><a class='"+css_class+"' href=\"javascript:setCalendarControlDate("+currentYear+","+currentMonth+","+dayOfMonth+")\">"+dayOfMonth+"</a></td>";

          dayOfMonth++;

        } else {

          table = table + "<td class='empty'>&nbsp;</td>";

        }

      }

      table = table + "</tr>";

    }



    table = table + "<tr class='header'><th colspan='7' style='padding: 3px;'><a href='javascript:clearCalendarControl();'>Clear</a> | <a href='javascript:hideCalendarControl();'>Close</a></td></tr>";

    table = table + "</table>";



    return table;

  }



  this.show = show;

  function show(field) {

    can_hide = 0;

  

    // If the calendar is visible and associated with

    // this field do not do anything.

    if (dateField == field) {

      return;

    } else {

      dateField = field;

    }



    if(dateField) {

      try {

        var dateString = new String(dateField.value);

        var dateParts = dateString.split("-");

        selectedYear = parseInt(dateParts[0],10);

        selectedMonth = parseInt(dateParts[1],10);

        selectedDay = parseInt(dateParts[2],10);

        

      } catch(e) {}

    }



    if (!(selectedYear && selectedMonth && selectedDay)) {

      selectedMonth = getCurrentMonth();

      selectedDay = getCurrentDay();

      selectedYear = getCurrentYear();

    }



    currentMonth = selectedMonth;

    currentDay = selectedDay;

    currentYear = selectedYear;



    if(document.getElementById){



      calendar = document.getElementById(calendarId);

      calendar.innerHTML = calendarDrawTable(currentYear, currentMonth);



      setProperty('display', 'block');



      var fieldPos = new positionInfo(dateField);

      var calendarPos = new positionInfo(calendarId);



      var x = fieldPos.getElementLeft();

      var y = fieldPos.getElementBottom();



      setProperty('left', x + "px");

      setProperty('top', y + "px");

 

      if (document.all) {

        setElementProperty('display', 'block', 'CalendarControlIFrame');

        setElementProperty('left', x + "px", 'CalendarControlIFrame');

        setElementProperty('top', y + "px", 'CalendarControlIFrame');

        setElementProperty('width', calendarPos.getElementWidth() + "px", 'CalendarControlIFrame');

        setElementProperty('height', calendarPos.getElementHeight() + "px", 'CalendarControlIFrame');

      }

    }

  }



  this.hide = hide;

  function hide() {

    if(dateField) {

      setProperty('display', 'none');

      setElementProperty('display', 'none', 'CalendarControlIFrame');

      dateField = null;

    }

  }



  this.visible = visible;

  function visible() {

    return dateField

  }



  this.can_hide = can_hide;

  var can_hide = 0;

}



var calendarControl = new CalendarControl();



function showCalendarControl(textField) {

  // textField.onblur = hideCalendarControl;

  calendarControl.show(textField);

}



function clearCalendarControl() {

  calendarControl.clearDate();

}



function hideCalendarControl() {

  if (calendarControl.visible()) {

    calendarControl.hide();

  }

}



function setCalendarControlDate(year, month, day) {

  calendarControl.setDate(year, month, day);

}



function changeCalendarControlYear(change) {

  calendarControl.changeYear(change);

}



function changeCalendarControlMonth(change) {

  calendarControl.changeMonth(change);

}



document.write("<iframe id='CalendarControlIFrame' src='javascript:false;' frameBorder='0' scrolling='no'></iframe>");

document.write("<div id='CalendarControl'></div>");

